206 research outputs found
Weak Ferromagnetism Above Tn In Gd2cuo4
No full textIn this work we report magnetization and Raman measurements performed in single crystals of Gd2CuO4. The data show the presence of two forbidden Raman modes (fRm), B*1g and B*2g, and weak ferromagnetism (WF) in the CuO2 planes up to temperatures well above TN Cu∼280K. We have studied the T-dependence of the intensity of these fRm and the WF component between 2 and 800K. The WF component and the relative intensity of the two fRm decrease with increasing T and they vanish at T∼650 and 520K, respectively. Recent neutron diffraction experiments observed a tetragonal to orthorhombic phase transition at T≅650K. These results are interpreted in terms of structural distortions within the CuO2 planes that lead to the existence of a distribution of coexisting tetragonal and orthorhombic crystallographic domains in this system. © 2001 Elsevier Science B.V. All rights reserved.30514855Tokura, Y., Takagi, H., Uchida, S., (1989) Nature, 337, p. 345Market, T., Maple, M.B., (1989) Solid State Commun., 70, p. 145Butera, A., Tovar, M., Oseroff, S.B., Fisk, Z., (1995) Phys. Rev. B, 52 (13), p. 444Maksimov, A.A., Tartakoskii, I.I., Timofeed, V.B., (1989) Physica C, 160, p. 249Endoh, Y., Matsuda, M., Yamada, K., Kakurai, K., Hidaka, Y., Shirane, G., Birgineau, R.J., (1989) Phys. Rev. B, 40, p. 7123Tovar, M., Obradors, X., Pérez, F., Oseroff, S.B., Duro, R.J., Rivas, J., Chateigner, D., Chenavas, J., (1992) Phys. Rev. B, 45, p. 4729Thompson, J.D., Cheong, S.W., Brown, S.E., Fisk, Z., Oseroff, S.B., Tovar, M., Vier, D.C., Schultz, S., (1989) Phys. Rev. B, 39, p. 6660Braden, M., Paulus, W., Cousson, A., Vigoureux, P., Heger, G., Goukassov, A., Bourges, P., Petitgrand, D., (1994) Europhys. Lett., 25, p. 625Markert, J.T., Early, E.A., Bjornholm, T., Ghamaty, S., Lee, B.W., Neumeier, J.J., Price, R.D., Maple, M.B., (1989) Physica C, 158, p. 178Oseroff, S.B., Rao, D., Wright, F., Vier, D.C., Schultz, S., Thompson, J.D., Fisk, Z., Tovar, M., (1990) Phys. Rev. B, 41, p. 1934Laguna, M.A., Sanjuan, M.L., Butera, A., Tovar, M., Fisk, Z., Canfield, P., (1993) Phys. Rev. B, 48, p. 7565Udagawa, M., Nagaoka, Y., Ogita, N., Masada, M., Akimitsu, J., Ohbayashi, K., (1994) Phys. Rev. B, 49, p. 585Alvarenga, A.D., Rao, D., Sanjurjo, J.A., Granado, E., Torriani, I., Rettori, C., Oseroff, S., Fisk, Z., (1996) Phys. Rev. B, 53, p. 837Pagliuso, P.G., (1998) Physica B, 253, p. 256Vigoureux, P., (1997) Physica C, 273, p. 239Vigoureux, P., (1995), Ph.D. Thesis, University of Paris-SUD, U.F.R. Scientific D'Orsay, France, JuneKubat-Martin, K.A., Fisk, Z., Ryan, R., (1988) Acta Crystallogr., 44 C, p. 1518Steren, L.B., Tovar, M., Oseroff, S.B., (1992) Phys. Rev. B, 46, p. 2874Steren, L.B., Fainstein, A., Tovar, M., Rouco, A., Perez, F., Obradors, X., Mira, J., Fisk, Z., (1993) J. Appl. Phys., 73, p. 5710Rouco, A., Obradors, X., Tovar, M., Pérez, F., (1994) Phys. Rev. B, 50, p. 9924Laguna, M.A., Sanjúan, M.L., Kanehisa, M., (1994) Physica C, 235-240, p. 1193Laguna, M.A., (1996), Ph.D. Thesis, University of Zaragoza, SpainVigoureux, P., Gukasov, A., Barilo, S.N., Zhigunov, D., (1997) Physica B, 234-236, p. 815Anderson, A., (1971) The Raman Effect, 1. , Marcel Dekker, New YorkHayes, W., Loudon, R., (1978) Scattering of Light by Crystals, , Wiley, New YorkAlvarenga, A.D., (1996) Physica B, 223-224, p. 52
Effects Of Cation Vacancies In The Phonon Raman Spectra Of Lamno3
No full textRaman spectra of La1-xMn1-xO3 (x = 0, 0.01, 0.017, 0.022, and 0.035) and La0.91-δMn1-δO3 polycrystalline samples, taken at T = 10 K and room temperature, are presented. All La1-xMn1-xO3 samples show at T = 10 K the presence of modes at about 480 and 610 cm-1, including the rhombohedral and quasi-cubic orthorhombic samples. However, the Raman spectrum of the rhombohedral La0.91-δMn1-δO3 sample does not show these modes at T = 10 K, but presents weak and broad structures at T = 295 K. These results are discussed in terms of local structural distortions associated with Mn vacancies and/or carrier localization in manganese perovskites.2201609613Zener, C., (1951) Phys. Rev., 82, p. 403Millis, A.J., Littlewood, P.B., Shraiman, B.I., (1995) Phys. Rev. Lett., 74, p. 5144Zhao, G., Conder, K., Keller, H., Muller, K.A., (1996) Nature (London), 381, p. 676Iliev, M.N., Abrashev, M.V., Lee, H.-G., Popov, V.N., Sun, Y.Y., Thomsen, C., Meng, R.L., Chu, C.W., (1998) Phys. Rev. B, 57, p. 2872Granado, E., Moreno, N.O., García, A., Sanjurjo, J.A., Rettori, C., Torriani, I., Oseroff, S.B., Tokura, Y., (1998) Phys. Rev. B, 58, p. 11435Podobedov, V.B., Weber, A., Romero, D.B., Rice, J.P., Drew, H.D., (1998) Phys. Rev. B, 58, p. 43Kanamori, J., (1960) J. Appl. Phys. Suppl., 31, pp. 14SRadaelli, P.G., Cox, D.E., Marezio, M., Cheong, S.-W., (1997) Phys. Rev. B, 55, p. 3015Granado, E., Pagliuso, P.G., Sanjurjo, J.A., Rettori, C., Oseroff, S.B., Causa, M.T., Butera, A., Schultz, S., (1998) Non Crystalline and Nanoscale Materials, pp. 105-115. , Eds. J. RIVAS and M.A. LÓPEZ-QUINTELA, World Scientific Publ. Co., SingaporeAbrashev, M.V., Ivanov, V.G., Iliev, M.N., Chakalov, R.A., Chakalova, R.I., Thomsen, C., (1999) Phys. Stat. Sol. (B), 215, p. 631Abrashev, M.V., Litvinchuk, A.P., Iliev, M.N., Meng, R.L., Popov, V.N., Ivanov, V.G., Chakalov, R.A., Thomsen, C., (1999) Phys. Rev. B, 59, p. 4146Roosmalen, J.A.M., Cordfunke, E.H.P., (1994) J. Solid State Chem., 110, p. 109Prado, F., Sánchez, R.D., Caneiro, A., Causa, M.T., Tovar, M., (1999) J. Solid State Chem., 146, p. 418Granado, E., García, A., Sanjurjo, J.A., Rettori, C., Torriani, I., Prado, F., Sánchez, R.D., Oseroff, S.B., (1999) Phys. Rev. B, 60, p. 1187
Electron Spin Resonance Of Gd3+ And Nd3+ In Luina4 (a = Cu,ni)
No full textLow-temperature (1.6 K≲T≲60 K) data of electron spin resonance for Gd3+ and Nd3+ diluted in LuInA4 (A = Cu,Ni) compounds are presented. The results are interpreted in terms of a density of states at the Fermi level built up of a single s band for the Cu-based system and a multiple (s and d) bands for the Ni-based system. The susceptibility and specific heat data show negligible electron-electron exchange enhancement for both compounds. For the Cu-based system the exchange interaction between the rare-earth (Gd3+ and Nd3+) local moment and the conduction electrons depends on the conduction-electron wave vector. ©1999 The American Physical Society.60191351513519Taylor, R.H., (1975) Adv. Phys., 24, p. 681Davidov, D., Orbach, R., Rettori, C., Shaltiel, D., Tao, L.J., Ricks, B., (1972) Solid State Commun., 10, p. 451Devine, R.A.B., Shaltiel, D., Moret, J.N., Zingg, W., Peter, M., (1972) Solid State Commun., 11, p. 525Koopman, G., Baberschke, K., Hufner, S., (1975) Phys. Lett., 50 A, p. 407Barberis, G.E., Davidov, D., Donoso, J.P., Gandra, F.G., Rettori, C., Suassuna, J.F., (1978) Solid State Commun., 28, p. 427Davidov, D., Orbach, R., Rettori, C., Shaltiel, D., Tao, L.J., Ricks, B., (1971) Phys. Lett., 37 A, p. 361Barberis, G.E., Davidov, D., Donoso, J.P., Rettori, C., Suassuna, J.F., Dokter, H.D., (1979) Phys. Rev. B, 19, p. 5495Troper, A., Gomes, A.A., (1986) Phys. Rev. B, 34, p. 6487Pagliuso, P.G., Rettori, C., Oseroff, S.B., Sarrrao, J., Fisk, Z., Cornelius, A., Hundley, M.F., (1997) Solid State Commun., 104, p. 223Rettori, C., Oseroff, S.B., Rao, D., Pagliuso, P.G., Barberis, G.E., Sarrrao, J., Fisk, Z., Hundley, M., (1997) Phys. Rev. B, 55, p. 1016Kojima, K., Nakai, Y., Sizuki, T., Asano, H., Izumi, F., Fujita, T., Hihara, T., (1990) J. Phys. Soc. Jpn., 59, p. 792Sarrao, J.L., Benton, C.L., Fisk, Z., Lawrence, J.M., Mandrus, D., Thompson, J.D., (1996) Physica B, 223-224, p. 366Feher, G., Kip, A.F., (1955) Phys. Rev., 98, p. 337Dyson, F.J., (1955) Phys. Rev., 98, p. 349Bachmann, R., DiSalvo, F.J., Geballe, T.H., Greene, R.L., Howard, R.E., King, C.N., Kivisch, H.C., Zubek, R.B., (1972) Rev. Sci. Instrum., 43, p. 205Pake, G.E., Purcell, E.M., (1948) Phys. Rev., 74, p. 1184Tao, L.J., Davidov, D., Orbach, R., Chock, E.P., (1971) Phys. Rev. B, 4, p. 5Yosida, K., (1957) Phys. Rev., 106, p. 893Korringa, J., (1950) Physica, 16, p. 601. , AmsterdamDavidov, D., Maki, K., Orbach, R., Rettori, C., Chock, E.P., (1973) Solid State Commun., 12, p. 621Moriya, T., (1963) J. Phys. Soc. Jpn., 18, p. 516Narath, A., (1967) Phys. Rev., 163, p. 232Davidov, D., Orbach, R., Rettori, C., Shaltiel, D., Tao, L.J., Ricks, B., (1971) Phys. Lett., 35 A, p. 339Rettori, C., Kim, H.M., Chock, E.P., Davidov, D., (1974) Phys. Rev. B, 10, p. 1826Abragam, A., Bleaney, B., (1970) EPR of Transitions Ions, , Clarendon, OxfordPagliuso, P.G., Rettori, C., Torelli, M.G., Martins, G.B., Fisk, Z., Sarrrao, J.L., Hundley, M.F., Oseroff, S.B., (1999) Phys. Rev. B, 60, p. 4176Shaw, R.W., Warren, W.W., (1971) Phys. Rev. B, 3, p. 1562Davidov, D., Chelkowski, A., Rettori, C., Orbach, R., Maple, M.B., (1973) Phys. Rev. B, 7, p. 1029Davidov, D., Orbach, R., Rettori, C., Tao, L.J., Ricks, B., (1972) Phys. Lett., 40 A, p. 269Barberis, G.E., Davidov, D., Donoso, J.P., Rettori, C., Suasuna, J.F., Dokter, H.D., (1979) Phys. Rev. B, 19, p. 5495Yafet, Y., Jaccarino, V., (1964) Phys. Rev., 133, p. 1630Takegahara, K., Kasuya, T., (1990) J. Phys. Soc. Jpn., 59, p. 3299Pagliuso, P.G., Rettori, C., Oseroff, S.B., Sarrrao, J., Fisk, Z., Cornelius, A., Hundley, M.F., (1997) Phys. Rev. B, 56, p. 893
Tuning The Bottleneck Effect In Ag Metallic Host Doped With Magnetic Gd And Non-magnetic Sb Ions
No full textThe Ag metallic host doped with Gd and Sb is an excellent model system to study the bottleneck effect associated to the conduction-electron (c-e) spin-flip scattering mechanism. Electron spin resonance of Gd3 + in both, Ag-(Gd doped)- and Ag-(Gd and Sb doped)-systems, reveal the presence of bottleneck which can be tuned by the amount of Gd and Sb impurities. The increase of the Gd concentration leads to a c-e spin-flip relaxation rate to the magnetic Gd3 + ions larger than that to the lattice, favoring the bottleneck regime. Whereas the effect of the non-magnetic impurities (Sb ions) is to increase, via spin-orbit scattering, the spin-flip relaxation rate of the c-e to the lattice, weakening the bottleneck regime. © 2009 Elsevier B.V. All rights reserved.4041827232725Zvyagin, A.A., Makarova, A.V., (2005) J. Phys. Condens. Matter, 17, p. 1251Barnes, S.E., (1981) Adv. Phys., 30, p. 801Taylor, R.H., (1975) Adv. Phys., 24, p. 681Overhauser, A.W., (1953) Phys. Rev., 89, p. 689Oseroff, S., Gehman, B., Schultz, S., Rettori, C., (1975) Phys. Rev. Lett., 35, p. 679Davidov, D., Rettori, C., Dixon, A., Baberschke, K., Chock, E.P., Orbach, R., (1973) Phys. Rev. B, 8, p. 3563Feher, G., Kip, A.F., (1955) Phys. Rev., 98, p. 337Dyson, F.J., (1955) Phys. Rev., 98, p. 349Pake, G.E., Purcell, E.M., (1948) Phys. Rev., 74, p. 1184Davidov, D., Maki, K., Orbach, R., Rettori, C., Chock, E.P., (1973) Solid State Commun., 12, p. 621Rettori, C., Kim, H.M., Chock, E.P., Davidov, D., (1974) Phys. Rev. B, 10, p. 1826Rettori, C., Oseroff, S.B., Rao, D., Pagliuso, P.G., Barberis, G.E., Sarrao, J., Fisk, Z., Hundley, M., (1997) Phys. Rev. B, 55, p. 1016Narath, A., (1967) Phys. Rev., 163, p. 232Shaw, R.W., Warren, W.W., (1971) Phys. Rev. B, 3, p. 1562Davidov, D., Rettori, C., Orbach, R., Dixon, A., Chock, E.P., (1975) Phys. Rev. B, 11, p. 354
Exchange Interaction Effects In The Esr Spectra Of Eu2 + In Lab6
No full textThe electron spin resonance (ESR) spectra of Eu2 +(4 f7, S = frac(7, 2)) in LaB6 single crystal show a single Dysonian resonance for the localized Eu2 + magnetic moments. It is shown that the Eu2 + ions are covalent exchange coupled to the (B) 2p-like host conduction electrons. © 2007 Elsevier B.V. All rights reserved.3982424426(1967) The Chemistry of Boron and its Compounds, , Muetterties E.L. (Ed), Wiley, New YorkLafferty, J.M., (1951) J. Appl. Phys., 22, p. 299Ahmed, H., Broers, A.N., (1972) J. Appl. Phys., 43, p. 2185Vanderberg, J.M., Matthias, B.T., Corenzwit, E., Borz, H., (1975) Mater. Res. Bull., 10, p. 889Urbano, R.R., Pagliuso, P.G., Rettori, C., Oseroff, S.B., Sarrao, J.L., Schlottmann, P., Fisk, Z., (2004) Phys. Rev. B, 70, p. 140401. , (Rapid Communication)Young, D.P., Hall, D., Torelli, M.E., Fisk, Z., Sarrao, J.L., Thompson, J.D., Ott, H.R., Zysler, R., (1999) Nature, 397, p. 412Abragam, A., Bleaney, B., (1970) EPR of Transition Ions, , Clarendon Press, OxfordFeher, G., Kip, A.F., (1955) Phys. Rev., 98, p. 337Dyson, F.J., (1955) Phys. Rev., 98, p. 349Pake, G.E., Purcell, E.M., (1948) Phys. Rev., 74, p. 1184Luft, H., Baberschke, K., Winzer, K., (1982) Z. Phys. B-Condens. Matter, 47, p. 195Rettori, C., Kim, H.M., Chock, E.P., Davidov, D., (1974) Phys. Rev., 10, p. 1826Bisch, P.M., Troper, A., Gomes, A.A., (1976) Phys. Rev. B, 13, p. 3902Troper, A., Lederer O.L.T. d.Menezes, P., Gomes, A.A., (1978) Phys. Rev. B, 18, p. 3709Barberis, G.E., Davidov, D., Donoso, J.P., Rettori, C., Suassuna, J.F., Dokter, H.D., (1979) Phys. Rev. B, 19, p. 5495Pagliuso, P.G., Rettori, C., Sarrao, J.L., Cornelius, A., Hundley, M.F., Fisk, Z., Oseroff, S.B., (1999) Phys. Rev. B, 60, p. 13515Davidov, D., Maki, K., Orbach, R., Rettori, C., Chock, E.P., (1973) Solid State Commun., 12, p. 621Hossain, F.M., Riley, D.P., Murch, G.E., (2005) Phys. Rev. B, 72, p. 23510
Dynamic magnetic response of LaMn0.5Ga0.5O3
No full textThe results of linear and non-linear magnetic AC susceptibility measurements are reported for polycrystalline
LaMn0.5Ga0.5O3. The observation of an asymmetric peak in the linear AC response at 59 K, accompanied by the
development of a sizeable second-harmonic component and of a double-peak third-harmonic signal, suggests the
establishment of a long-range ordered magnetic ground state with unconventional dynamics. The results are compatible
with a picture assuming a canted antiferromagnetic structure or the presence of ferromagnetic domains embedded in an
antiferromagnetic matrix
Esr Study Of The Eu2+ G -value In The Metallic Phase Of Cubic Hexaboride Ca1-x Eux B6 (0.15 X≤1.00)
No full textThe angular, magnetic field, and temperature dependence of the Eu2+ (4 f7, S=7/2) g -value in Ca1-x Eux B6 (0.15 x≤1.00) is measured by means of electron spin resonance at two microwave frequencies, 9.4 and 34.4 GHz. The g -value is found to be anisotropic and magnetic-field-dependent. The reduction with field of the positive g -shift is interpreted in terms of the exchange interaction between the localized Eu2+ 4 f7 electrons with the conduction Eu2+ 5d -like electrons and B 2p -like holes. The angular, temperature, and x dependence of the anisotropy of the g -value can be attributed to demagnetization effects due to the platelet-like shape of the samples. High-resolution synchrotron x-ray diffraction experiments show the absence of distortions larger than δa/a∼ 10-4. However, a mechanism for the anisotropy based on a weak tetragonal lattice distortion arising from the crystal surface cannot be excluded. © 2006 The American Physical Society.7311Etourneau, J., Hagenmuller, P., (1985) Philos. Mag. B, 52, p. 589. , PMABDJ 1364-2812Young, D.P., Hall, D., Torelli, M.E., Fisk, Z., Sarrao, J.L., Thompson, J.D., Ott, H.R., Zysler, R., (1999) Nature (London), 397, p. 412. , NATUAS 0028-0836 10.1038/17081Zhitomirsky, M.E., Rice, T.M., Anisimov, V.I., (1999) Nature (London), 402, p. 251. , NATUAS 0028-0836 10.1038/46204Degiorgi, L., Felder, E., Ott, H.R., Sarrao, J.L., Fisk, Z., (1997) Phys. Rev. Lett., 79, p. 5134. , PRLTAO 0031-9007 10.1103/PhysRevLett.79.5134Massidda, S., Continenza, A., De Pascale, T.M., Monnier, R., (1997) Z. Phys. B: Condens. Matter, 102, p. 83. , ZPCMDN 0722-3277 10.1007/s002570050267Süllow, S., Prasad, I., Aronson, M.C., Sarrao, J.L., Fisk, Z., Hristova, D., Lacerda, A.H., Gibbs, D., (1998) Phys. Rev. B, 57, p. 5860. , PRBMDO. 0163-1829. 10.1103/PhysRevB.57.5860Booth, C.H., Sarrao, J.L., Hundley, M.F., Cornelius, A.L., Kwei, G.H., Bianchi, A., Fisk, Z., Lawrence, J.M., (2001) Phys. Rev. B, 63, p. 224302. , PRBMDO 0163-1829 10.1103/PhysRevB.63.224302Paschen, S., Pushin, D., Schlatter, M., Vonlanthen, P., Ott, H.R., Young, D.P., Fisk, Z., (2000) Phys. Rev. B, 61, p. 4174. , PRBMDO 0163-1829 10.1103/PhysRevB.61.4174Wigger, G.A., Walti, Ch., Ott, H.R., Bianchi, A.D., Fisk, Z., (2002) Phys. Rev. B, 66, p. 212410. , PRBMDO 0163-1829 10.1103/PhysRevB.66.212410Wigger, G.A., Beeli, C., Felder, E., Ott, H.R., Bianchi, A.D., Fisk, Z., (2004) Phys. Rev. Lett., 93, p. 147203. , PRLTAO 0031-9007 10.1103/PhysRevLett.93.147203Uimin, G., (1997) Phys. Rev. B, 55, p. 8267. , PRBMDO 0163-1829 10.1103/PhysRevB.55.8267Sturm, H., Elschner, B., Hock, K.-H., (1985) Phys. Rev. Lett., 54, p. 1291. , PRLTAO 0031-9007 10.1103/PhysRevLett.54.1291Al'Tshuler, T.S., Bresler, M.S., (1999) JETP, 88, p. 1019. , JTPHES 1063-7761 10.1134/1.558885Al'Tshuler, T.S., Bresler, M.S., (1999) JETP, 115, p. 1860. , JTPHES 1063-7761Süllow, S., Prasad, I., Aronson, M.C., Bogdanovich, S., Sarrao, J.L., Fisk, Z., (2000) Phys. Rev. B, 62, p. 11626. , PRBMDO. 0163-1829. 10.1103/PhysRevB.62.11626Urbano, R.R., Pagliuso, P.G., Rettori, C., Oseroff, S.B., Sarrao, J.L., Schlottmann, P., Fisk, Z., (2004) Phys. Rev. B, 70, p. 140401. , PRBMDO 0163-1829 10.1103/PhysRevB.70.140401Urbano, R.R., Pagliuso, P.G., Rettori, C., Schlottmann, P., Sarrao, J.L., Bianchi, A., Nakatsuji, S., Oseroff, S.B., (2005) Phys. Rev. B, 71, p. 184422. , PRBMDO 0163-1829 10.1103/PhysRevB.71.184422Feher, G., Kip, A.F., (1955) Phys. Rev., 98, p. 337. , PHRVAO 0031-899X 10.1103/PhysRev.98.337Dyson, F.J., (1955) Phys. Rev., 98, p. 349. , PHRVAO 0031-899X 10.1103/PhysRev.98.349Pake, G.E., Purcell, E.M., (1948) Phys. Rev., 74, p. 1184. , PHRVAO 0031-899X 10.1103/PhysRev.74.1184Giles, C., Yokaichiya, F., Kycia, S.W., Sampaio, L.C., Ardiles-Saravia, D.C., Franco, M.K.K., Neuenschwander, R.T., (2003) J. Synchrotron Radiat., 10, p. 430. , JSYRES 0909-0495 10.1107/S0909049503020958Abragam, A., Bleaney, B., (1970) EPR of Transition Ions, , Clarendon Press, OxfordKunii, S., Uemura, T., Chiba, Y., Kasuya, T., Date, M., (1985) J. Magn. Magn. Mater., 52, p. 271. , JMMMDC 0304-8853 10.1016/0304-8853(85)90277-XKunii, S., (2000) J. Phys. Soc. Jpn., 69, p. 3789. , JUPSAU 0031-9015 10.1143/JPSJ.69.3789Bisch, P.M., Troper, A., Gomes, A.A., (1976) Phys. Rev. B, 13, p. 3902. , PRBMDO 0163-1829 10.1103/PhysRevB.13.3902Troper, A., De Menezes, O.L.T., Lederer, P., Gomes, A.A., (1978) Phys. Rev. B, 18, p. 3709. , PLRBAQ 0556-2805 10.1103/PhysRevB.18.3709Barberis, G.E., Davidov, D., Donoso, J.P., Rettori, C., Suassuna, J.F., Dokter, H.D., (1979) Phys. Rev. B, 19, p. 5495. , PRBMDO 0163-1829 10.1103/PhysRevB.19.5495Pagliuso, P.G., Rettori, C., Sarrao, J.L., Cornelius, A., Hundley, M.F., Fisk, Z., Oseroff, S.B., (1999) Phys. Rev. B, 60, p. 13515. , PRBMDO 0163-1829 10.1103/PhysRevB.60.13515Calderón, M.J., Wegener L, G.L., Littlewood, P.B., (2004) Phys. Rev. B, 70, p. 092404. , PRBMDO. 0163-1829. 10.1103/PhysRevB.70.092404Davidov, D., Maki, K., Orbach, R., Rettori, C., Chock, E.P., (1973) Solid State Commun., 12, p. 621. , SSCOA4 0038-1098 10.1016/0038-1098(73)90299-8Henke, B.L., Gullikson, E.M., Davis, J.C., (1993) At. Data Nucl. Data Tables, 54, p. 181. , ADNDAT 0092-640X 10.1006/adnd.1993.1013see also www-cxro.lbl.govCalvo, R., Isaacson, R.A., Sroubek, Z., (1969) Phys. Rev., 177, p. 484. , PHRVAO 0031-899X 10.1103/PhysRev.177.484Oseroff, S., Calvo, R., (1970) Phys. Lett., 32, p. 393. , PYLAAG 0375-9601Rettori, C., Rao, D., Oseroff, S., Zysler, R.D., Tovar, M., Fisk, Z., Cheong, S.-W., Vier, D.C., (1991) Phys. Rev. B, 44, p. 826. , PRBMDO 0163-1829 10.1103/PhysRevB.44.826Kittel, Ch., (1948) Phys. Rev., 73, p. 155. , PHRVAO 0031-899X 10.1103/PhysRev.73.15
Magnetic Polaron And Fermi Surface Effects On The Esr Spin-flip Scattering Of Eub6 Above Tc ≈ 15 K
No full textThe spin-flip scattering (SFS) between conduction and Eu 2+4f7 (8S7/2) electrons in the paramagnetic phase of EuB6 (T≥TC ≈ 15K) is studied by electron spin resonance (ESR) and magneto-resistance (MR) experiments. The observed Dysonian resonance suggests a metallic environment for the Eu 2+ ions. ESR at high field, H ≅ 12.05kG (v ≅ 33.9 GHz), shows an anisotropic line width with cubic symmetry. ESR at low-field, 1.46kG (4.1 GHz) and 3.35kG (9.5 GHz), shows broader line width and smaller anisotropy than at higher field. The narrowing and anisotropy of the line width at high fields are indicative of a homogeneous resonance where the line width is mainly governed by the SFS mechanism due to the exchange interaction between Eu 2+ 4f7 and conduction electrons. Besides the negative MR, we found an anisotropic MR with cubic symmetry. These results are interpreted in terms of magnetic polaron and Fermi surface effects. © 2004 Elsevier B.V. All rights reserved.3541-4 SPEC. ISS.326330Hasegawa, A., Yanase, A., (1979) J. Phys. C, 12, p. 5431Massidda, S., Continenza, A., De Pascale, T.M., Monnier, R., (1997) Z. Phys. B: Cond. Mat., 102, p. 83Goodrich, R.G., Harrison, N., Vuillemin, J.J., Teklu, A., Hall, D.W., Fisk, Z., Young, D., Sarrao, J., (1998) Phys. Rev. B, 58, p. 14896Aronson, M.C., Sarrao, J.L., Fisk, Z., Whitton, M., Brandt, B.L., (1999) Phys. Rev. B, 59, p. 4720Sullow, S., Prasad, I., Aronson, M.C., Sarrao, J.L., Fisk, Z., Hristova, D., Lacerda, A.H., Gibbs, D., (1998) Phys. Rev. B, 57, p. 5860Sullow, S., Prasad, I., Aronson, M.C., Bogdanovich, S., Sarrao, J.L., Fisk, Z., (2000) Phys. Rev. B, 62, p. 11626Degiorgi, L., Felder, E., Ott, H.R., Sarrao, J.L., Fisk, Z., (1997) Phys. Rev. Lett., 79, p. 5134Nyhus, P., Yoon, S., Kauffman, M., Cooper, S.L., Fisk, Z., Sarrao, J., (1997) Phys. Rev. B, 56, p. 2717Snow, C.S., Cooper, S.L., Young, D.P., Fisk, Z., Comment, A., Ansermet, J.P., (2001) Phys. Rev. B, 64, p. 174412Broderick, S., Ruzicka, B., Degiorgi, L., Ott, H.R., Sarrao, J.L., Fisk, Z., (2002) Phys. Rev. B, 65, p. 121102Paschen, S., Pushin, D., Schlatter, M., Vonlanthen, P., Ott, H.R., Young, D.P., Fisk, Z., (2000) Phys. Rev. B, 61, p. 4174Fisk, Z., Johnston, D.C., Cornut, B., Von Molnar, S., Oseroff, S., Calvo, R., (1979) J. Appl. Phys., 50, p. 1911Henggeler, W., Ott, H.R., Young, D.P., Fisk, Z., (1998) Solid State Commun., 108, p. 929Young, D.P., (1999) Nature (London), 397, p. 412Feher, G., Kip, A.F., (1955) Phys. Rev., 98, p. 337Dyson, F.J., (1955) Phys. Rev., 98, p. 349Pake, G.E., Purcell, E.M., (1948) Phys. Rev., 74, p. 1184Urbano, R.R., Rettori, C., Barberis, G.E., Torelli, M., Bianchi, A., Fisk, Z., Pagliuso, P.G., Oseroff, S.B., (2002) Phys. Rev. B, 65, p. 180407Noack, M.A., Verhoeven, J.D., (1980) J. Cryst. Growth, 49, p. 595Oseroff, S.B., Calvo, R., (1978) Phys. Rev. B, 18, p. 3041R.R. Urbano, et al., unpublishedSperlich, G., Jansen, K., (1974) Solid State Commun., 15, p. 1105Davidov, D., Maki, K., Orbach, R., Rettori, C., Chock, E.P., (1973) Solid State Commun., 12, p. 62
Esr Of Gd3+ In The Kondo-lattice Compound Ybagcu4 And Its Reference Compounds Ragcu4 (r=y,lu)
No full textLow-temperature (T<30 K) electron-spin-resonance (ESR) experiments of Gd3+ diluted in the Kondo-lattice compound YbAgCu4 and its reference compounds YAgCu4 and LuAgCu4 are interpreted in terms of an enhanced density of states at the Fermi level for the Yb-based compound. The results of susceptibility and ESR (Korringa rate and g-shift) measurements show negligible electron-electron exchange enhancement for all the studied compounds. The exchange interaction between the Gd3+ local moment and the conduction electrons (c-e) is c-e wave vector dependent in all three compounds.561489338937Falicov, L.M., Hanke, W., Maple, M.B., (1981) Valence Fluctuation in Solids, , North-Holland, AmsterdamWachter, P., Boppart, H., (1982) Valence Instabilities, , North-Holland, AmsterdamMuller-Hartmann, E., Roden, B., Wohlleben, D., (1984) Valence Fluctuation, , North-Holland, AmsterdamBarberis, G.E., Foglio, M.E., Crow, J.E., Schlottmann, P., (1991) Valence Fluctuations, , North-Holland, AmsterdamKojima, K., Nakai, Y., Sizuki, T., Asano, H., Izumi, F., Fujita, T., Hihara, T., (1990) J. Phys. Soc. Jpn., 59, p. 792Rossel, C., Yang, K.N., Maple, M.B., Fisk, Z., Zirngiebl, E., Thompson, J.D., (1987) Phys. Rev. B, 35, p. 1914Fisk, Z., Maple, M.B., (1992) J. Alloys Compd., 183, p. 303Pillmayr, N., Bauer, E., Yoshimura, K., (1992) J. Magn. Magn. Mater., 104-107, p. 639Rajan, V.T., (1983) Phys. Rev. Lett., 51, p. 308Coqblin, B., Schrieffer, J.R., (1963) Phys. Rev., 185, p. 847Rettori, C., Oseroff, S.B., Rao, D., Pagliuso, P.G., Barberis, G.E., Sarrao, J., Fisk, Z., Hundley, M., (1997) Phys. Rev. B, 55, p. 1016Sarrao, J.L., Benton, C.L., Fisk, Z., Lawrence, J.M., Mandrus, D., Thompson, J.D., (1996) Physica B, 223-224, p. 366Sarrao, J.L., Immer, C.D., Benton, C.L., Fisk, Z., Lawrence, J.M., Mandrus, M., Thompson, J.D., (1996) Phys. Rev. B, 54, p. 12207Bachmann, R., DiSalvo, F.J., Geballe, T.H., Greene, R.L., Howard, R.E., King, C.N., Kivisch, H.C., Zubek, R.B., (1972) Rev. Sci. Instrum., 43, p. 205Feher, G., Kip, A.F., (1955) Phys. Rev., 98, p. 337Dyson, F.J., (1955) Phys. Rev., 98, p. 349Pake, G.E., Purcell, E.M., (1948) Phys. Rev., 74, p. 1184Yosida, K., (1957) Phys. Rev., 106, p. 893Korringa, J., (1950) Physica, 16, p. 601. , AmsterdamMoriya, T., (1963) J. Phys. Soc. Jpn., 18, p. 516Narath, A., (1967) Phys. Rev., 163, p. 232Davidov, D., Maki, K., Orbach, R., Rettori, C., Chock, E.P., (1973) Solid State Commun., 12, p. 621Davidov, D., Orbach, R., Rettori, C., Shaltiel, D., Tao, L.J., Ricks, B., (1971) Phys. Lett., 35 A, p. 339Rettori, C., Kim, H.M., Chock, E.P., Davidov, D., (1974) Phys. Rev. B, 10, p. 1826Narath, A., Weaver, H.T., (1968) Phys. Rev., 175, p. 373Shaw, R.W., Warren, W.W., (1971) Phys. Rev. B, 3, p. 1562Davidov, D., Chelkowski, A., Rettori, C., Orbach, R., Maple, M.B., (1973) Phys. Rev. B, 7, p. 1029Barberis, G.E., Davidov, D., Donoso, J.P., Rettori, C., Suassuna, J.F., Dokter, H.D., (1979) Phys. Rev. B, 19, p. 5495Abragam, A., Bleaney, B., (1970) EPR of Transition Ions, , Clarendon, OxfordSchlottmann, P., (1985) Theory of Heavy Fermion and Valence Fluctuation, p. 68. , edited by T. Kasuya and T. Saso Springer-Verlag. BerlinTsujii, N., He, J., Yoshimura, K., Kosuge, K., Michor, H., Kreiner, K., Hilscher, G., (1997) Phys. Rev. B, 55, p. 1032Watson, R.E., Freeman, A.J., Koide, S., (1969) Phys. Rev. B, 186, p. 625Continentino, M.A., (1993) Phys. Rev. B, 47, p. 11587Barberis, G.E., Davidov, D., Rettori, C., Donoso, J.P., Torriani, I., Gandra, F.C.G., (1980) Phys. Rev. Lett., 45, p. 1966Schaeffer, H., Elschner, B., (1983) Z. Phys. B, 53, p. 109Gandra, F.G., Schultz, S., Oseroff, S.B., Fisk, Z., Smith, J.L., (1985) Phys. Rev. Lett., 55, p. 2719Gandra, F.G., Pontes, M.J., Schultz, S., Oseroff, S.B., (1987) Solid State Commun., 64, p. 85
Gradual Transition From Insulator To Semimetal Of Ca1-x Eux B6 With Increasing Eu Concentration
No full textThe local environment of Eu2+ (4 f7, S=7 2) in Ca1-x Eux B6 (0.003≤x≤1.00) is investigated by means of electron spin resonance (ESR). For x 0.003 the spectra show resolved fine and hyperfine structures due to the cubic crystal electric field and nuclear hyperfine field, respectively. The resonances have Lorentzian line shape, indicating an insulating environment for the Eu2+ ions. For 0.003 x 0.07, as x increases, the ESR lines broaden due to local distortions caused by the Eu Ca ions substitution. For 0.07 x 0.30, the lines broaden further and the spectra gradually change from Lorentzian to Dysonian resonances, suggesting a coexistence of both insulating and metallic environments for the Eu2+ ions. In contrast to Ca1-x Gdx B6, the fine structure is still observable up to x≈0.15. For x 0.30 the fine and hyperfine structures are no longer observed, the line width increases, and the line shape is purely Dysonian, anticipating the semimetallic character of EuB6. This broadening is attributed to a spin-flip scattering relaxation process due to the exchange interaction between conduction and Eu2+ 4f electrons. High-field ESR measurements for x 0.15 reveal smaller and anisotropic linewidths, which are attributed to magnetic polarons and Fermi surface effects, respectively. © 2005 The American Physical Society.7118Young, D.P., (1999) Nature (London), 397, p. 412. , NATUAS 0028-0836 10.1038/17081Zhitomirsky, M.E., (1999) Nature (London), 402, p. 251. , NATUAS 0028-0836 10.1038/46204Balents, L., Varma, C.M., (2000) Phys. Rev. Lett., 84, p. 1264. , PRLTAO 0031-9007 10.1103/PhysRevLett.84.1264Barzykin, V., Gor'Kov, L.P., (2000) Phys. Rev. Lett., 84, p. 2207. , PRLTAO 0031-9007 10.1103/PhysRevLett.84.2207Jarlborg, T., (2001) Physica B, 307, p. 291. , PHYBE3 0921-4526 10.1016/S0921-4526(01)00629-9Jarlborg, T., (2000) Phys. Rev. Lett., 85, p. 186. , PRLTAO 0031-9007 10.1103/PhysRevLett.85.186Ceperley, D., (1999) Nature (London), 397, p. 386. , NATUAS 0028-0836 10.1038/17011Tromp, H.J., (2001) Phys. Rev. Lett., 87, p. 016401. , PRLTAO 0031-9007 10.1103/PhysRevLett.87.016401Massidda, S., Continenza, A., De Pascale, T.M., Monnier, R., (1997) Z. Phys. B: Condens. Matter, 102, p. 83. , ZPCMDN 0722-3277 10.1007/s002570050267Urbano, R.R., Rettori, C., Barberis, G.E., Torelli, M., Bianchi, A., Fisk, Z., Pagliuso, P.G., Oseroff, S.B., (2002) Phys. Rev. B, 65, p. 180407. , PRBMDO 0163-1829 10.1103/PhysRevB.65.180407Moriwaka, T., (2001) J. Phys. Soc. Jpn., 70, p. 341. , JUPSAU 0031-9015 10.1143/JPSJ.70.341Hall, D., (2001) Phys. Rev. B, 64, p. 233105. , PRBMDO 0163-1829 10.1103/PhysRevB.64.233105Vonlanthen, P., (2000) Phys. Rev. B, 62, p. 10076. , PRBMDO 0163-1829 10.1103/PhysRevB.62.10076Ott, H.R., (1997) Z. Phys. B: Condens. Matter, 102, p. 337. , ZPCMDN 0722-3277 10.1007/s002570050297Gavilano, J.L., (2001) Phys. Rev. B, 63, p. 140410. , PRBMDO 0163-1829 10.1103/PhysRevB.63.140410Gianniò, K., (2002) J. Phys.: Condens. Matter, 14, p. 1035. , JCOMEL. 0953-8984. 10.1088/0953-8984/14/5/308Denlinger, J.D., (2002) Phys. Rev. Lett., 89, p. 157601. , PRLTAO 0031-9007 10.1103/PhysRevLett.89.157601Rhyee, J., Cho, B.K., Ri, H.-C., (2003) Phys. Rev. B, 67, p. 125102. , PRBMDO 0163-1829 10.1103/PhysRevB.67.125102Souma, S., Komatsu, H., Takahashi, T., Kaji, R., Sasaki, T., Yokoo, Y., Akimitsu, J., (2003) Phys. Rev. Lett., 90, p. 027202. , PRLTAO 0031-9007 10.1103/PhysRevLett.90.027202Terashima, T., (2000) J. Phys. Soc. Jpn., 69, p. 2423. , JUPSAU 0031-9015 10.1143/JPSJ.69.2423Matsubayashi, K., (2002) Nature (London), 420, p. 143. , NATUAS 0028-0836 10.1038/420143bFisk, Z., (2002) Nature (London), 420, p. 144. , NATUAS 0028-0836 10.1038/420144aBennett, M.C., Van Lierop, J., Berkeley, E.M., Mansfield, J.F., Henderson, C., Aronson, M.C., Young, D.P., Lacerda, A., (2004) Phys. Rev. B, 69, p. 132407. , PRBMDO 0163-1829 10.1103/PhysRevB.69.132407Süllow, S., (1998) Phys. Rev. B, 57, p. 5860. , PRBMDO. 0163-1829. 10.1103/PhysRevB.57.5860Paschen, S., (2000) Phys. Rev. B, 61, p. 4174. , PRBMDO 0163-1829 10.1103/PhysRevB.61.4174Wigger, G.A., Walti, Ch., Ott, H.R., Bianchi, A.D., Fisk, Z., (2002) Phys. Rev. B, 66, p. 212410. , PRBMDO 0163-1829 10.1103/PhysRevB.66.212410Wigger, G.A., Monnier, R., Ott, H.R., Young, D.P., Fisk, Z., (2004) Phys. Rev. B, 69, p. 125118. , PRBMDO 0163-1829 10.1103/PhysRevB.69.125118Calderon, M.J., Wegener, L.G.L., Littlewood, P.B., (2004) Phys. Rev. B, 70, p. 092408. , PRBMDO 0163-1829 10.1103/PhysRevB.70.092408Kuneš, J., Pickett, W.E., (2004) Phys. Rev. B, 69, p. 165111. , PRBMDO 0163-1829 10.1103/PhysRevB.69.165111Pereira, V.M., Lopes Dos Santos, J.M.B., Castro, E.V., Castro-Neto, A.H., (2004) Phys. Rev. Lett., 93, p. 147202. , PRLTAO 0031-9007 10.1103/PhysRevLett.93.147202Urbano, R.R., Pagliuso, P.G., Sarrao, J.L., Oseroff, S.B., Rettori, C., Bianchi, A., Nakatsuji, S., Fisk, Z., (2004) J. Magn. Magn. Mater., 272-276 (1 SUPPL.), p. 1659. , JMMMDC 0304-8853Urbano, R.R., Pagliuso, P.G., Rettori, C., Oseroff, S.B., Sarrao, J.L., Schlottmann, P., Fisk, Z., (2004) Phys. Rev. B, 70, p. 140401. , PRBMDO 0163-1829 10.1103/PhysRevB.70.140401Abragam, A., Bleaney, B., (1970) EPR of Transition Ions, , Clarendon Press, OxfordDavidov, D., Rettori, C., Zevin, V., (1975) Solid State Commun., 16, p. 247. , SSCOA4 0038-1098 10.1016/0038-1098(75)90584-0Rettori, C., Davidov, D., Grayewskey, A., Walsh, W.M., (1975) Phys. Rev. B, 11, p. 4450. , PLRBAQ 0556-2805 10.1103/PhysRevB.11.4450Luft, H., Baberschke, K., Winzer, K., (1982) Z. Phys. B: Condens. Matter, 47, p. 195. , ZPCMDN 0722-3277Oseroff, S.B., Calvo, R., (1978) Phys. Rev. B, 18, p. 3041. , PLRBAQ 0556-2805 10.1103/PhysRevB.18.3041Pake, G.E., Purcell, E.M., (1948) Phys. Rev., 74, p. 1184. , PHRVAO 0031-899X 10.1103/PhysRev.74.1184Bloembergen, N., (1952) J. Appl. Phys., 23, p. 1383. , JAPIAU 0021-8979 10.1063/1.1702079Feher, G., Kip, A.F., (1955) Phys. Rev., 98, p. 337. , PHRVAO 0031-899X 10.1103/PhysRev.98.337Dyson, F.J., (1955) Phys. Rev., 98, p. 349. , PHRVAO 0031-899X 10.1103/PhysRev.98.349Sperlich, G., Jansen, K., (1974) Solid State Commun., 15, p. 1105. , SSCOA4 0038-1098 10.1016/0038-1098(74)90542-0Buckmaster, H.A., Shing, Y.H., (1972) Phys. Status Solidi a, 12, p. 325. , PSSABA 0031-8965Bartkowski, M., Northcott, D.J., Park, J.M., Deddoch, A.H., Hedgcock, F.T., (1985) Solid State Commun., 56, p. 659. , SSCOA4 0038-1098 10.1016/0038-1098(85)90773-2Davidov, D., Maki, K., Orbach, R., Rettori, C., Chock, E.P., (1973) Solid State Commun., 12, p. 621. , SSCOA4 0038-1098 10.1016/0038-1098(73)90299-8Essam, J.W., (1972) Phase Transitions and Critical Phenomena, 2, p. 197. , edited by C. Domb and M. S. Green (Academic Press, LondonSchlottmann, P., Hellberg, C.S., (1996) J. Appl. Phys., 79, p. 6414. , JAPIAU 0021-8979 10.1063/1.362014Oseroff, S., Calvo, R., Stankiewicz, J., Fisk, Z., Johnston, D.C., (1979) Phys. Status Solidi B, 94, p. 133. , PSSBBD 0370-1972Aronson, M.C., Sarrao, J.L., Fisk, Z., Whitton, M., Brandt, B.L., (1999) Phys. Rev. B, 59, p. 4720. , PRBMDO 0163-1829 10.1103/PhysRevB.59.4720Fisk, Z., (1979) J. Appl. Phys., 50, p. 1911. , JAPIAU 0021-8979 10.1063/1.327162Goodrich, R.G., Harrison, N., Vuillemin, J.J., Teklu, A., Hall, D.W., Fisk, Z., Young, D., Sarrao, J., (1998) Phys. Rev. B, 58, p. 14896. , PRBMDO 0163-1829 10.1103/PhysRevB.58.14896Götze, W., Wölfle, P., (1971) J. Low Temp. Phys., 5, p. 575. , JLTPAC. 0022-2291Wigger, G.A., Beeli, C., Felder, E., Ott, H.R., Bianchi, A.D., Fisk, Z., (2004) Phys. Rev. Lett., 93, p. 147203. , PRLTAO 0031-9007 10.1103/PhysRevLett.93.14720
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